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Evaluating the Hydrological Components Contributions to Terrestrial Water Storage Changes in Inner Mongolia with
Yi Guo1,2, Naichen Xing1,2, Fuping Gan1,2
1China Aero Geophysical Survey and Remote Sensing Center for Natural Resources, China Geological Survey, Beijing 100083, China.
Sensors (Basel, Switzerland)
|July 29, 2023
Summary
Terrestrial water storage changes in Inner Mongolia varied by region from 2003-2021. Soil moisture dominated changes in one zone, while groundwater depletion significantly impacted others, highlighting regional water resource dynamics.
Area of Science:
- Earth Science
- Hydrology
- Remote Sensing
Background:
- Inner Mongolia faces complex water resource management challenges.
- Understanding terrestrial water storage (TWS) dynamics is crucial for sustainable water use.
- Regional variations in water storage components require detailed investigation.
Purpose of the Study:
- To quantitatively assess the contributions of surface water, soil moisture, and groundwater to TWS changes in five Inner Mongolian groundwater resource zones (GW_I-V).
- To analyze the trends and spatial variability of TWS components from 2003 to 2021.
- To identify the primary drivers of TWS changes across different groundwater resource zones.
Main Methods:
- Utilized multiple remote sensing data sources for quantitative analysis.
- Analyzed temporal trends in terrestrial water storage, soil moisture, and groundwater storage.
- Calculated the contribution of each water storage component to overall TWS changes.
Main Results:
- Terrestrial water storage increased in GW_I (2.14 mm/a) but decreased in GW_II-V (-2.62 to -5.89 mm/a).
- Soil moisture generally increased across all zones (0.25 to 4.17 mm/a).
- Significant groundwater storage decreases were observed in all zones (-2.21 to -6.87 mm/a), particularly in GW_IV (76% of TWS changes).
- Soil moisture was the main contributor to TWS changes in GW_I (58%), while groundwater was dominant in GW_II-V.
Conclusions:
- Groundwater depletion is a major concern in most Inner Mongolian groundwater resource zones.
- Soil moisture dynamics play a significant role in TWS changes, especially in GW_I.
- Remote sensing is a valuable tool for monitoring and understanding regional water resource dynamics and informing water management strategies.
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